Upright-piano action



(No Model.)

J. W. FISCHER.

UPRIGHT PIANO ACTION.

Patented Mar. 31, 1896.

was

UNITED STATES PATENT OFFICE.

JOHN IV. FISCHER, OF BALTIMORE, MARYLAND.

UPRlGHT-PIANO ACTION.

SPECIFICATION forming part of Letters Patent No. 557,261, dated March31, 1896.

Application filed August 2, 1895. Serial No. 558,036. (No model.)

To aZZ whom, it may concern.-

Be it known that 1, JOHN W. FISCHER, a citizen of the United States ofAmerica, and a resident of Baltimore, Maryland, have invented new anduseful Improvements in Upright-Piano Actions, of which the following isa specification.

This invention relates to repetition action, and has for its object toprovide in its construction a cheap and simple means to produce what isknown as trilling.

In the accompanying drawings, forming part of this specification, Figure1 is a side view showing the position of the parts when at rest. Fig. 2is a side view showing the position of the parts after the stroke of thekey.

Similar letters have due reference to similar parts throughout figures.

The letter A represents the hammer; the letter B, the string; C, thebutt; D, thejack; E, the back-check; F, the counter-check; G, thecounter-check shank; II, the whip of any ordinary upright-piano action.The letter I represents the spring, which is pivoted to an extended endof the back-check E at its center or coiled part, and has at its innerend an eye for the reception of a cord or tape. Said cord or tape isattached to the countercheck shank G. The letter J is an adjustablecushioned button for regulating the tension of spring I at its outerend. The letter K is an adjustable cushioned button for limiting theaction of the spring I at its inner or eyed end. These form thecomponent parts relative to my present invention.

It will be understood that at the stroke of the key the hammer A, fromthe resistance of the string B, is forced back and causes the engagementof the counter-check F with the back-check E, whereby the hammer A isheld at a limited distance from the string B according to the forceexerted. At the same time the back-check E has made an upward andrearward motion, which causes the engagement of the outer end of thespring I with the adjustable cushioned button J. This contact produces atension of the spring I at its inner or eyed end. As the key is slightlyreleased, the grip of the counter-check F and the back-check E hasbecome modified and the hammer A is forced rearward by the inner or eyedend of the spring I through the medium of the cord or tape attached tothe counter-check shank G. At the same instant the inner or eyed end ofthe springI engages with the adjustable cushioned button K and limitsthe aforesaid motion of the hammer A.

It will also be understood that when the key has been allowed to riseone-third of its upward motion the jack D engages with the butt 0, andthereby the repetition of the tone can be produced without entirelyreleasing the key, as in ordinary upright-piano actions.

Vhat I claim is 1. In an upright-piano action the combination of theback-check and hammer-butt through the medium of a cord or tape,attached to the counter-check shank, a spring connected to the extendedend of the backcheck, and engaging with said cord or tape; and means forregulating the tension of said spring substantially as specified.

2. In an upright-piano action the combina' tion of the back-check andhammer-butt, a cord or tape attached to the counter-check shank, aspring connected to an extended end of the back-check, and engaging withsaid cord or tape, an adjustable cushioned button which engages withsaid spring, at its outer end, which regulates tension of saidspring,with means of limiting action of spring, substantially asspecified.

3. In an upright-piano action, the combination of the back-check andhammer-butt by means of a cord, or tape attached to countercheck shank;a spring connected to backcheck, by means of an extension, said springengaging with the cord or tape, an adjustable cushioned buttonregulating tension of said spring; an adjustable cushioned buttonlimiting the action of said spring substantially as specified.

JOHN W. FISCHER. lVitnesses:

EUGENE GEARY, JOHN LOCK.

